coroutine/doc/performance.qbk

[/
          Copyright Oliver Kowalke 2009.
 Distributed under the Boost Software License, Version 1.0.
    (See accompanying file LICENSE_1_0.txt or copy at
          http://www.boost.org/LICENSE_1_0.txt
]

[section:performance Performance]

Performance of __boost_coroutine__ was measured on the platforms shown in the
following table. Performance measurements were taken using `rdtsc` and
`boost::chrono::high_resolution_clock`, with overhead corrections, on x86
platforms. In each case, cache warm-up was accounted for, and the one
running thread was pinned to a single CPU. The code was compiled using the
build options, 'variant = release cxxflags = -DBOOST_DISABLE_ASSERTS
optimization = speed' (stack-unwinding disabled).

[table Perfomance of asymmetric coroutines
    [
        [Platform]
        [switch]
        [construction (protected stack-allocator)]
        [construction (preallocated stack-allocator)]
        [construction (standard stack-allocator)]
    ]
    [
        [i386 (AMD Athlon 64 DualCore 4400+, Linux 32bit)]
        [53 ns / 54 cycles]
        [195 ms / 216006 cycles]
        [9 ms / 9691 cycles]
        [629 ns / 603 cycles]
    ]
    [
        [x86_64 (Intel Core2 Q6700, Linux 64bit)]
        [12 ns / 39 cycles]
        [37 ms / 101999 cycles]
        [3 ms / 9719 cycles]
        [248 ns / 632 cycles]
    ]
]

[table Perfomance of symmetric coroutines
    [
        [Platform]
        [switch]
        [construction (protected stack-allocator)]
        [construction (preallocated stack-allocator)]
        [construction (standard stack-allocator)]
    ]
    [
        [i386 (AMD Athlon 64 DualCore 4400+, Linux 32bit)]
        [50 ns / 52 cycles]
        [221 ms / 214170 cycles]
        [245 ns / 245 cycles]
        [481 ns / 501 cycles]
    ]
    [
        [x86_64 (Intel Core2 Q6700, Linux 64bit)]
        [10 ns / 33 cycles]
        [35 ms / 90504 cycles]
        [95 ns / 241 cycles]
        [199 ns / 508 cycles]
    ]
]


[endsect]